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Search Results: 1 - 10 of 382022 matches for " DE ARCO R "
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EVALUACIóN DE PLAGUICIDAS 0RGAN0CL0RAD0S POR HS-SPME - GC/ECD EN LECHE PASTEURIZADA COMERCIALIZADA EN LA CIUDAD DE CARTAGENA (COLOMBIA)
DE ARCO R,DENILES DEL CARMEN; JARAMILLO C,BEATRIZ EUGENIA;
Biotecnología en el Sector Agropecuario y Agroindustrial , 2011,
Abstract: pesticides have been used worldwide since the mid-twentieth century, public health campaigns and agricultural practices. organochlorine pesticides (pocs) have greater impact on the environment because they are not biodegradable, are lipophilic, have great mobility around the globe and greater tendency to bioaccumulate through the food chain. in order to identify and quantify organochlorine pesticides in pasteurized whole milk, two brands (a and b), sold in the city of cartagena de indias, the present investigation was carried out using solid phase microextraction headspace chromatography gas with electron capture detector(hs-spme-gc/ecd). 36 samples were analyzed (n = 36), 18 from each brand. 100% of the samples (n = 36) were positive for the pesticide lindane (γ-hch), exceeding the maximum residual limit (mrl) of 0.01 mg / kg, set by the food and agriculture organization and the world health organization (fao/who). the average concentrations obtained for brand a were of 0.042 mg/ kg ± 0.003and0.062 ± 0.0016mg/kg (fatbasis) for brand b, notexceeding the acceptable daily intake (adi) of 0.001 mg / kg body weight.
EVALUACIóN DE PLAGUICIDAS 0RGAN0CL0RAD0S POR HS-SPME - GC/ECD EN LECHE PASTEURIZADA COMERCIALIZADA EN LA CIUDAD DE CARTAGENA (COLOMBIA) A AVALIAQáO DOS PESTICIDAS ORGANOCLORADOS POR HS-SPME - GC/ECD EM LEITE PASTEURIZADO COMERCIALIZADAS NA CIDADE CARTAGENA (COLOMBIA) EVALUATION OF PESTICIDES BY HS-SPME ORGANOCHLORINE - GC / ECD IN PASTEURIZED MILK MARKETED IN THE CITY CARTAGENA (COLOMBIA)
DENILES DEL CARMEN DE ARCO R,BEATRIZ EUGENIA JARAMILLO C
Biotecnología en el Sector Agropecuario y Agroindustrial , 2011,
Abstract: Los plaguicidas han sido utilizados en todo el mundo desde mediados del siglo XX, en campa as de Salud Pública y en prácticas agrícolas. Los Plaguicidas Organoclorados (POCs) presentan mayor impacto sobre el ambiente porque no son biodegradables, son lipofílicos, tienen gran movilidad por todo el planeta y gran tendencia a la bioacumulación, através de la cadena trófica. Con el objetivo de identificar y cuantificar plaguicidas organoclorados en leche entera pasteurizada de dos marcas (A y B), que se comercializan en la ciudad de Cartagena de Indias, se realizó la presente investigación, utilizando Microextracción en Fase Sólida en Espacio de Cabeza y Cromatografía de Gases con Detector de Captura de Electrones (HS-SPME-GC/ECD). Fueron analizadas 36 muestras (n=36), 18 de cada marca. El 100% de las muestras (n=36) resultaron positivas para el plaguicida lindano (γ-HCH), superando el Límite Máximo Residual (LMR) de 0,01 mg/kg, establecido por la Food and Agriculture Organization y la Organización Mundial de la Salud (FAO/OMS). Las concentraciones promedio de lindano obtenidas para la marca A fueron de 0,042 mg/kg ± 0,003 y 0,062 ± 0,0016 mg/kg (base grasa) para la marca B, no superando la Ingesta Diaria Admisible (IDA) de 0,001 mg/kg de peso corporal. Os pesticidas têm sido usados em todo o mundo desde meados do século XX, as campanhas de saúde pública e práticas agrícolas. Os inseticidas organoclorados (AP) têm maior impacto sobre o meio ambiente porque n o s o biodegradáveis, s o lipofílicas, têm grande mobilidade ao redor do mundo e maior tendencia para a bioacumula o através da cadeia alimentar. A fim de identificar e quantificar pesticidas organoclorados em leite integral, duas marcas (A e B), comercializada na cidade de Cartagena das índias, a presente investiga o foi realizada por cromatografia em Fase Sólida, Microextra o Headspace Gás com Detector de Captura de Elétrons(HS-SPME-GC/ECD). 36 amostras foram analisadas (n = 36), 18 de cada marca. 100% das amostras (n = 36) foram positivas para o pesticida lindano (γ-HCH), ultrapassando o limite máximo residual (LMR) de 0,01 mg/kg, definido pela Organiza o para a Alimenta o e Agricultura eo Mundo Organiza o Mundial da Saúde (FA0 / OMS). As concentra es médias obtidas para o tipo A foi de 0,042 mg/kg± 0,003 e 0,062 ± 0,0016 mg / kg B (gordura) Base para a marca, n o superior a Ingest o Diaria Aceitável (IDA) de 0,001 mg/kg de peso corporal. Pesticides have been used worldwide since the mid-twentieth century, public health campaigns and agricultural practices. Organochlorine pesticides (POCs) have
A arte enquanto possível dire o do tratamento na clínica da psicose: relato de caso
Melina Del?Arco de Oliveira
SMAD Revista Electrónica Salud Mental, Alcohol y Drogas , 2006,
Abstract: En un Centro de Atención Psicosocial para usuarios de alcohol y drogas, un paciente psicótico de 29 a os presenta una importante comorbilidad y se dirige a un trabajo terapéutico con la arte. En la oficina de arte, reconstruye un personaje del mundo futbolístico y restaura sus proyectos e inserción social. A la luz de la teoría lacaniana, el analista testificó esta producción de manera que el propio sujeto pudo significarla en búsqueda de sentidos para sí. Así, la arte puede contribuir para la reconstitución de sentidos para el sujeto psicótico y la exposición de la obra artística puede expurgar el anonimato del sujeto, inscribiéndole en el público, desviando la mirada estigmatizante del Otro.
Estudantes universitários: a influência das variáveis socio-econ?micas e culturais na carreira
Oliveira, Melina Del'Arco de;Melo-Silva, Lucy Leal;
Psicologia Escolar e Educacional , 2010, DOI: 10.1590/S1413-85572010000100003
Abstract: in this paper we describe the profile of senior undergraduates attending courses in chemistry, biological sciences and psychology in a brazilian public university. we propose to study the influence of socio-demographic and academic variables () on their career. the 140 participants answered a questionnaire on socio-demographic variables: parental education, family income, social-economical level and type of elementary and high school (public or private) they attend. the academic variables (marks) were obtained from the university files. the data about career paths were obtained from interviews with six participants. the data were analyzed both quantitatively, according to unvaried models - the square q test, the non-parametrical test: kruskal-wallis and mann-whitney and qualitatively, according to bardin (1977). both national and international theoretical frameworks underpinned the discussion. the study reveals that parental education, socio-economical level and type of elementary and high school attended are directly related to their success in the university entrance tests and career choice.
Infecciones oportunistas del sistema nervioso central en pacientes con VIH atendidos en el Hospital Universitario Erasmo Meoz, Cúcuta, 1995-2005 Opportunistic infections of the Central Nervous System (CNS) occurring in HIV infected patients from Erasmo Meoz Hospital in Cúcuta, Colombia
JAIRO LIZARAZO,FRANCY CASTRO,MICKE DE ARCO,óSCAR CHAVES
Infectio , 2006,
Abstract: Objetivo. Describir las infecciones oportunistas del sistema nervioso central en los pacientes con VIH atendidos en un hospital del tercer nivel del nororiente colombiano. Dise o. Se utilizó un dise o observacional descriptivo de revisión de historias clínicas. Lugar. Se llevó a cabo en el Hospital Universitario Erasmo Meoz de Cúcuta, Colombia. Población. Comprendió los pacientes que conviven con el VIH atendidos durante el periodo 1995-2005. Mediciones. Se estudió la frecuencia de aparición de las variables analizadas. Resultados. Se encontraron 131 casos de infección del sistema nervioso central. Predominaron los hombres (72,5%) y los adultos jóvenes (promedio 33,8 a os). La gran mayoría (94,7%) provenía del departamento de Norte de Santander. Las infecciones diagnosticadas del sistema nervioso central fueron: encefalitis por Toxoplasma gondii (56,5%), criptococosis meníngea (38,9%) y tuberculosis meníngea (4,6%). Sólo el 31,3% de los pacientes estaba recibiendo terapia antirretroviral de alta efectividad y la infección del sistema nervioso central definió el sida en 79,4% de los casos. De los pacientes evaluados, 93,0% tenía menos de 200 células CD4+/mm3. El 42% de los pacientes estaban vivos a los 6 meses: la supervivencia en los pacientes con toxoplasmosis cerebral fue del 50% mientras que, para aquéllos con criptococosis meníngea fue del 37%. Conclusión. Las infecciones oportunistas del sistema nervioso central son frecuentes en esta población y tienen un gran impacto sobre su supervivencia. Objective. To describe the opportunistic infections of the central nervous system occurring in HIV infected patients diagnosed and treated in a third level hospital in northeast Colombia. Design. Descriptive, observational study based on the review of clinical records. Place. Erasmo Meoz University Hospital in Cúcuta, Colombia. Population. Patients living with HIV attended at the Hospital during the 1995-2005 period. Measurements. Frequency of the analyzed variables. Results. One hundred thirty one CNS infections were found. Most of the patients were males (72.5%), young adults (mean age: 33.8 years) from Norte de Santander (94.7%). The CNS infections diagnosed were Toxoplasma gondii encephalitis (56.5%), meningeal cryptococcosis (38.9%), meningeal tuberculosis (4.6%). Only 31.3% patients were receiving Highly Active Antiretroviral Therapy (HAART). CNS infection defined AIDS in 79.4% of the cases. 93.0% of the patients had <200 CD4+ cells/mm3; only 42% survived 6 months after the diagnosis of the opportunistic infection. In patients with cerebral toxoplasmosis
Security of public key cryptosystems based on Chebyshev Polynomials
Pina Bergamo,Paolo D'Arco,Alfredo De Santis,Ljupco Kocarev
Computer Science , 2004,
Abstract: Chebyshev polynomials have been recently proposed for designing public-key systems. Indeed, they enjoy some nice chaotic properties, which seem to be suitable for use in Cryptography. Moreover, they satisfy a semi-group property, which makes possible implementing a trapdoor mechanism. In this paper we study a public key cryptosystem based on such polynomials, which provides both encryption and digital signature. The cryptosystem works on real numbers and is quite efficient. Unfortunately, from our analysis it comes up that it is not secure. We describe an attack which permits to recover the corresponding plaintext from a given ciphertext. The same attack can be applied to produce forgeries if the cryptosystem is used for signing messages. Then, we point out that also other primitives, a Diffie-Hellman like key agreement scheme and an authentication scheme, designed along the same lines of the cryptosystem, are not secure due to the aforementioned attack. We close the paper by discussing the issues and the possibilities of constructing public key cryptosystems on real numbers.
All or Nothing at All
Paolo D'Arco,Navid Nasr Esfahani,Douglas R. Stinson
Computer Science , 2015,
Abstract: We continue a study of unconditionally secure all-or-nothing transforms (AONT) begun in \cite{St}. An AONT is a bijective mapping that constructs s outputs from s inputs. We consider the security of t inputs, when s-t outputs are known. Previous work concerned the case t=1; here we consider the problem for general t, focussing on the case t=2. We investigate constructions of binary matrices for which the desired properties hold with the maximum probability. Upper bounds on these probabilities are obtained via a quadratic programming approach, while lower bounds can be obtained from combinatorial constructions based on symmetric BIBDs and cyclotomy. We also report some results on exhaustive searches and random constructions for small values of s.
Dendrometria de espécies nativas em plantios homogêneos no estado de Roraima: andiroba (Carapa guianensis Aubl), castanha-do-Brasil (Bertholletia excelsa Bonpl.), ipê-roxo (Tabebuia avellanedae Lorentz ex Griseb) e jatobá (Hymenaea courbaril L.)
Tonini, Helio;Arco-Verde, Marcelo Francia;Sá, Sergio Pedreira Pereira de;
Acta Amazonica , 2005, DOI: 10.1590/S0044-59672005000300008
Abstract: the growth and selection of equations for four native forest species was studied aiming to identify promising species for homogeneous stands, and agroflorestry systems in the roraima state. the growth of andiroba (carapa guianensis aubl.), castanha-do-brasil (bertholletia excelsa bonpl.), ipê-roxo (tabebuia avellanedae lorentz ex griseb) and jatobá (hymenaea courbaril l.) to the seven years of age, revealed to be promising, reaching mean annual increments in merchantable volume of 6.3; 14.6; 6.0 and 2.3 m3.ha-1 year-1, respectively. regarding diameter growth, all the species presented mean annual increments over than 1 cm, being higher than the observed ones for trees growing in natural forests. the statistical analyses indicated the hypsometric prodan equation as of better adjustment for the analyzed species. however, the graphical analysis indicated that the shape of the h/d curve varied with the species. the fit of merchantable volume and commercial form factor equations demonstrated to be necessarily different equations for each species. the graphical analysis of the merchantable volume and form factor curves showed that the species differed in both the parameters, indicating that the use of an average form factor for all the species must be avoided.
Infecciones oportunistas del sistema nervioso central en pacientes con VIH atendidos en el Hospital Universitario Erasmo Meoz, Cúcuta, 1995-2005
LIZARAZO,JAIRO; CASTRO,FRANCY; DE ARCO,MICKE; CHAVES,óSCAR; PE?A,YENI;
Infectio , 2006,
Abstract: objective. to describe the opportunistic infections of the central nervous system occurring in hiv infected patients diagnosed and treated in a third level hospital in northeast colombia. design. descriptive, observational study based on the review of clinical records. place. erasmo meoz university hospital in cúcuta, colombia. population. patients living with hiv attended at the hospital during the 1995-2005 period. measurements. frequency of the analyzed variables. results. one hundred thirty one cns infections were found. most of the patients were males (72.5%), young adults (mean age: 33.8 years) from norte de santander (94.7%). the cns infections diagnosed were toxoplasma gondii encephalitis (56.5%), meningeal cryptococcosis (38.9%), meningeal tuberculosis (4.6%). only 31.3% patients were receiving highly active antiretroviral therapy (haart). cns infection defined aids in 79.4% of the cases. 93.0% of the patients had <200 cd4+ cells/mm3; only 42% survived 6 months after the diagnosis of the opportunistic infection. in patients with cerebral toxoplasmosis survival was 50% whereas in patients with meningeal cryptococcosis it was 37%. conclusion. central nervous system infections are very common in our hiv infected population and they have a great impact on patient?s survival.
Asociación entre disfuncionalidad familiar y síntomas depresivos con importancia clínica en estudiantes de Cartagena, Colombia
Cogollo,Zuleima; Gómez,Edna; De Arco,Oney′s; Ruiz,Indira; Campo-Arias,Adalberto;
Revista Colombiana de Psiquiatría , 2009,
Abstract: introduction: the presence of clinically important depressive symptoms is the result of multiple factors. it has been pointed out that dysfunctional families relate positively with depressive symptoms with clinical significance. however, data are divergent. objective: to establish the association between family dysfunction and depressive symptoms among adolescent students of a school in a low socio-economic level sector in cartagena, colombia. method: a cross-sectional study was carried out with secondary school students. family dysfunction was quantified with the apgar family questionnaire, and clinically important depressive symptoms with the zung' scale for depression. logistic regression was used to control confounding variables. results: the participants were 424 students from the seventh to the eleventh grade. average age was 14.7 years (sd=1.6), 59% were girls, and the school grade average was 8.6 (sd=1.3). family dysfunction was present in 41% and clinically important depressive symptoms were found in 41% of students. there was a lack of association between dysfunctional families and depressive symptoms with clinical significance (or=1.4, 95%ci 0.92-2.1), after controlling for other variables. conclusions: family dysfunction and clinically important depressive symptoms are not associated in students living in areas with low socio-economic levels in cartagena, colombia.
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